Head about to Explode!
Le Mans Master
Joined: Apr 2006
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even with 64 cc heads and the dished pistons your compression will still not be ideal still a little low. Do a cam 212 int with a tighter lsa. At the low duration number your using you will still have good idle vacuum. The tighter lsa will start pulling a bit lower in rpm and harder in the mid range. Both higher duration the worst contributor and wide lsa lower compression ratios. Something you cant afford to lose.
Le Mans Master
Joined: Apr 2006
Posts: 5,403
Likes: 95
Dont be affaid with a cam at that low duration to use a 108 lsa. The low duration will keep you in the 2000 to 5500 range and the tighter lsa will in crease its overlap a bit. Will make the cam start pulling a bit lower and harder in the mid range. It will narrow the width of the power band a bit.
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Joined: Jan 2018
Posts: 58
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From: Tampa Florida
Dont be affaid with a cam at that low duration to use a 108 lsa. The low duration will keep you in the 2000 to 5500 range and the tighter lsa will in crease its overlap a bit. Will make the cam start pulling a bit lower and harder in the mid range. It will narrow the width of the power band a bit.
Thanks to all, and Merry Christmas, Happy Holidays, and Happy New Year!
Le Mans Master
Joined: Apr 2006
Posts: 5,403
Likes: 95
When you pull your engine apart assuming the block has never been decked check to see if who ever put 76cc heads on it did not use ..039 or .041 compressed thickness gaskets that are common in most full gasket engine sets. Originally your iron headed engine had ..018 comppressed steal shim gaskets and 76cc chamber heads for as remember 8.25 comp. Even that was a bit optomistic. If the block has never been decked look for a .015 or not much more gasket thats compatibal with an aluminum head you cant use steal shim gaskets with an aluminum head. Anyone that would put 76cc heads back on a dished piston engine sure did not care about any power. Just make sure how far your pistons are down in the hole.
Last edited by Little Mouse; Dec 23, 2018 at 08:41 PM.
Le Mans Master
Joined: Oct 2010
Posts: 6,937
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From: melbourne florida
2023 C3 of the Year Finalist - Modified
Just for grins if the engine is in good shape have you thought about putting a curve in your distributor and advancing the timing? You might be suprised.
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Joined: Jan 2018
Posts: 58
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From: Tampa Florida
When you pull your engine apart assuming the block has never been decked check to see if who ever put 76cc heads on it did not use ..039 or .041 compressed thickness gaskets that are common in most full gasket engine sets. Originally your iron headed engine had ..018 comppressed steal shim gaskets and 76cc chamber heads for as remember 8.25 comp. Even that was a bit optomistic. If the block has never been decked look for a .015 or not much more gasket thats compatibal with an aluminum head you cant use steal shim gaskets with an aluminum head. Anyone that would put 76cc heads back on a dished piston engine sure did not care about any power. Just make sure how far your pistons are down in the hole.
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From: Tampa Florida
Le Mans Master
Joined: Sep 2001
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From: Unreconstructed, South Carolina
To OP
With $2K overall budget in mind ...
Those heads you've picked seem a great choice.
But, with wise shopping & (especially) if you were to "settle" for a bit less expensive heads, I can also see a hydraulic roller cam & lifter setup.
With $2K overall budget in mind ...
Those heads you've picked seem a great choice.
But, with wise shopping & (especially) if you were to "settle" for a bit less expensive heads, I can also see a hydraulic roller cam & lifter setup.
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Joined: Jan 2018
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From: Tampa Florida
Jackson, you just gave my headache back, just kidding��. I’m thinking those heads for future down the line if and when the bottom end needs to be rebuilt or changed out, then roller cam will come into play, with decent set of heads in the mix. But for now, I’ll stick to my path. Thanks for the input.