after rebuilt changed everthing magna flux block and heads went 30 over on heads new pistions rods & berings put in proformance cam and put a holly 4 brl 600 cfm secondairy vacume, everthing milled in engine dinoed the engine and peak at 4500 rpms 275 hp and 425 on tork the specs in the oem manuel call for 340 hp at 5800 rpms and 465 on tork is this right or did they fudge the # back in 64 emgine block stamp is kw for 425 ci what did we do rong is is this right any thoughts thanks john
An engine doesn't peak hp and torque at the same rpm. Do you have the dyno sheet - can you post it here. Cam specs would also help. I am not a nailhead guy but I would have to say a 750 on a mild build would be better - maybe even bigger
1st, they did a lot of fudging back then. I like a bigger carb, but also have to look at what kind of vacuum you were getting on the dyno pull @ max hp. Did you do any work to the heads?
With .030 of the heads, increase duration on the cam you should be in the 750 range on the carb. A '66 Q-Jet will serve you well. Did you re-curve the distributor to keep up with the intake? A little advance will help. These engines were dead on the horsepower rating. You need to run a high octane with the heads cut. We are building the Reynolds 65 GS. Jim Bell is assisting from Cal. with engine detail.
i dont think they re-curved the dist we did take out the points and went electronic using org dist can u change the jets on the carbs to up it:idea2:
What cam did you put in it? What was done to the heads - were they ported? What was the exhaust setup on the dyno? In terms of carbs, I'm running an 850 Holley DP with the specs listed in my sig. Aside from the mileage sucking, it works great!
get a mr. gasket recurve kit,,,, follow the enclosed directions and you will pick up some good increase of power... then rig up a red neck ram air and you will pick up 8% of what ever your engine puts out.... all for cheap.... read my stickey in wrenching secrets....
