68 Yenco clone

[original owner]

chris, 68 yenkos had 140 mph speedo's, mine had no P.S. as allthe other ones kline chev sold in 68, also no ac, nopower steering all were ss's 4 speeds. you should really get rid of the auto. trans. They had passenger car engines ( L 36's, low comp. 10.25 to one,hydro lifters small carb,small heads, small intake manifolds, mild cams.) the factory rating wae 390 H.P. which was very high. Had this motor in a 69 vette. absolutly no where to go, to up H.P. You want a L 72 4 speed 100%. As to clones , yenkos new, were the biggest clones of all, think about this and reply. thanks Bob krueger

[SuperNovaSS]

Bob,


Are you trying to say the cars that Yenko converted came from gM with L-36 engines???

[PeteLeathersac]

As I've always understood, all '68 Copo 9737 cars were shipped w/ the unique MV Suffix 396 L78 engines installed and planned for Yenko to transplant 427/425 L72 shortblocks reusing the heads etc..
* Note not all cars were converted and some were sold and/or dealer traded w/ their MV Suffix L78's still intact..

Can anyone post the unique carb #'s shipped w/ these MV Suffix L78's?.
Also what was the factory HP rating of the MV Suffix L78's?.

[img]<<GRAEMLIN_URL>>/beers.gif[/img]
~ Pete

[auschris001]

Pete &amp; Bob,

I have found at least 4 block numbers #3869942, #3904351, #3916321, and #3935439 that are 427 numbers
Q: Is there just one specific number for the L72 L88 ???

Cheers,Chris

[original owner]

Gentlemen the camaros sold in 67 and 69 with the auto tran's, had hydro, lifters, There H,P. ratings were 1967 410 H.P. 1969 425 H.P. There are no hydro. lifters on L72 427 V8's. In 1968 all camaros were m21 4 speeds, with L72 427's The L36 was producted according to G.M. from 1966 to 1969. G. M. futher states that the L36 was ment for large pass. cars,, med. trucks, but also found it's way into corvettes, plus the large body bel air, Impala car's in the late 60's.the same motor with 3x2 barrels in a vette was rated at 400 H.P.With a diff. L number.I had one in 69 an L36. As to 67's,most had the blocks changed at dealer(yenko) except auto trans cars.Factory built that way,the tranny's of the day had a very hard time in auto form handling the H.P. of the L72. All 68's had 4 speed m21's,L72's(as all the three year's should have had, no auto's) And the majority of 68,s had the L72,s FACTORY installed and all 69's.This comes from several people who I talked when I worked for chev. in the mid 70's,who worked on this project for chev. yenko over rated the H.P. in the 68 camaro's from 425 to 450 also the 69's, the same. the auto trans camaros were also over rated. 67 from 390H.P.to 410, 69 from factory rating 390 to 425 yenko H.P.?The 68 4speed camaros, L72 factory 425, yenko 450H.P.But in his defense he did modify them some. never heard of a L-88 yenko camaro, but thats just the ones I saw shipped to minnesota. Question of the day whats a ZLX 427 chev v8. thank you Bob krueger.

[budnate]

http://mecum.com/auctions/lot_detail...D=SC0509-79421

Hey Bob...in answer to your question of the day, the ZLX was a Motion promoted big block configuration ....L88 shortblock with iron open chamber heads.

Additionally, I don't believe the L36 was <span style="text-decoration: underline">ever</span> intended for medium duty work. Medium duty trucks had 366 and 427 tall deck engine configurations; 10.200-inch deck height versus a passenger car deck height of 9.800-inches. As many are aware, the extra deck height was incorporated so that a four ring piston could be used on the medium duties.

None-the-less, thanks for the Memories! [img]<<GRAEMLIN_URL>>/smile.gif[/img]

Wayne

[original owner]

Wayne, close but not accurate.This is from chevrolet, ZLX, 12.25 comp. L 88, ZL1, hybred.Iron block, alum. heads. In house use only, not sold. motion no thing to do with this motor.produced from late 60's to around late' 90's(chev alittle hazy about end date) only used for experimental purpose. end of the line for hi perf. 427's. most H.P. of all but unreliable. From chevrolet, also l-36 , desighed as a big block of medium H.P. for the use in the heavy sedan;s coupes they planed to build, and also as a motor for med. duty trucks, because of the broad torque band. Used to work for chev. back in the 70's, 80's. had chev monte carlo demo's 454, 345 H.P. chevy also used med H.P. 427,454. motors in there own brand of motor homes, in the 70's. remember those? Those were the days my friend , we though they would never end but. Thanks Bob krueger

[SuperNovaSS]

chris,


The 858 Heads are 66 and the 291 heads are late 69-70. Although both are closed chamber rectangular port heads, you will need 840 castings to be correct for a 68.

Jason

[sYc]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: original owner</div><div class="ubbcode-body"> Gentlemen the camaros sold in 67 and 69 with the auto tran's, had hydro, lifters, There H,P. ratings were 1967 410 H.P. 1969 425 H.P. There are no hydro. lifters on L72 427 V8's. In 1968 all camaros were m21 4 speeds, with L72 427's The L36 was producted according to G.M. from 1966 to 1969. G. M. futher states that the L36 was ment for large pass. cars,, med. trucks, but also found it's way into corvettes, plus the large body bel air, Impala car's in the late 60's.the same motor with 3x2 barrels in a vette was rated at 400 H.P.With a diff. L number.I had one in 69 an L36. As to 67's,most had the blocks changed at dealer(yenko) except auto trans cars.Factory built that way,the tranny's of the day had a very hard time in auto form handling the H.P. of the L72. All 68's had 4 speed m21's,L72's(as all the three year's should have had, no auto's) <span style="color: #FF6666">I am not for sure why you feel all Yenkos should have been 4 speeds, as beginning in '68 GM had a very good auto trans, that could handle the solid lifter 427 quite well, even when modified. I know of several such beasts that will give a 4speed a run for their money. </span> And the majority of 68,s had the L72,s FACTORY installed and all 69's.This comes from several people who I talked when I worked for chev. in the mid 70's,who worked on this project for chev. yenko over rated the H.P. in the 68 camaro's from 425 to 450 also the 69's, the same. the auto trans camaros were also over rated. 67 from 390H.P.to 410, 69 from factory rating 390 to 425 yenko H.P.? <span style="color: #FF6666"> '69 auto was 390 HP...You are joking..right?</span> The 68 4speed camaros, L72 factory 425, yenko 450H.P.But in his defense he did modify them some. never heard of a L-88 yenko camaro, but thats just the ones I saw shipped to minnesota. Question of the day whats a ZLX 427 chev v8. thank you Bob krueger. </div></div>