Performance Engine Build...

[2manymustangs]

Whats that mill supposed to make?

@11.7 you better not plan on filling up on the water- anywhere.

When is coming out here so I can ride in it?

UD

with 73.5 cc combustion chambers and assuming a .045 thick head gasket and very minimal valve reliefs (flat tops with valve reliefs were stock on CJs). some of the later CJs had the piston down in the hole by a fair amount to drop the compression but my 1970 block/parts end up with nearly zero deck clearance. I think the actual CR is down closer to 11:1...

When you throw the small chamber CJ heads on a 460 you instantly go WAY up over 13:1, that is why all of the big stroker ford pistons are dished (inverted dome)...

[Uncle Dave]

with 73.5 cc combustion chambers and assuming a .045 thick head gasket and very minimal valve reliefs (flat tops with valve reliefs were stock on CJs). some of the later CJs had the piston down in the hole by a fair amount to drop the compression but my 1970 block/parts end up with nearly zero deck clearance. I think the actual CR is down closer to 11:1...

When you throw the small chamber CJ heads on a 460 you instantly go WAY up over 13:1, that is why all of the big stroker ford pistons are dished (inverted dome)...

I guess the question still stands- hows it gonna run? and whats it going to do in your boat?

So you got a non pump gas friendly mill.

Once you commit to race gas you can't just drop onto any ole place and fill up so that pretty much defines the boats role.

If you are going to run race gas then you can run 13:1 and over.

Love race gas toys. Id like to have one as a third boat someday.

UD

[2manymustangs]

I guess the question still stands- hows it gonna run? and whats it going to do in your boat?

So you got a non pump gas friendly mill.

Once you commit to race gas you can't just drop onto any ole place and fill up so that pretty much defines the boats role.

If you are going to run race gas then you can run 13:1 and over.

Love race gas toys. Id like to have one as a third boat someday.

UD

I put about 50 hours on the engine just running 93 octane pump gas and it never did ping/knock HOWEVER it was pretty darn hard to load the engine with a four speed and 4:30 gears and 9" slicks... In the "water dyno" it should be easy to see if it will ping and bust up the 40+ year old TRW figure 8 slugs...


The boat had a 600" NA chebby the day I bought it and was so stupidly over powered for my taste that I didnt think it necessary to go crazy with a new engine right off the bat...


I got sentimental and bought the wrong boat, this belonged to THREE close friends of mine, two were high school buddies and the first died of cancer... What I really need is a 21' Raysoncraft hull like the GN47/GN24 that I can run at LOTO and on our big lakes... This is one reason I haven't hit the water, we dont really have too many good gathering places for Vdrives/hot boats around here and the lake I grew up on wouldn't allow this boat on the water... I've lost motivation, I need something with MUCHO more freeboard...





What I need:

[gn7]

Vic, IMO you should just delete this thread and close the forum You already have a "marine" engine forum, and there us NOTHING remotely related to building a in this thread. More like Bruce doing his best Grads imitation. Like said, JMO, and we both know what that's worth around here.

[HB Vic]

Vic, IMO you should just delete this thread and close the forum You already have a "marine" engine forum, and there us NOTHING remotely related to building a in this thread. More like Bruce doing his best Grads imitation. Like said, JMO, and we both know what that's worth around here.

Lol....good morning mr grinch