I am rebuilding the motor (92 305 TPI) and I have a new set of Comp cams springs (981-16) and was wondering if they will work. I was thinking about getting some 1.6 RR, would the springs I have work with the added lift from using the 1.6 RR?

Thanks guys.

 

If you're rebuilding the motor you would be remiss in your duties as a hot rodder if you didn't swap a decent cam in while you were at it. Even if you are just bolting this engine together as an experiment to see how hard you can spray it before it pops i still wouldn't leave a stock cam in it if it was out of the car.

As for the springs, IIRC 981s handle 0.500 or more of lift. More than anough spring for practically any reasonable cam for a street 305.

 

Z,

I hate to jump on Ed's bandwagon, but when a guy is right, he's right. The 981s are dual (dampered) springs that should fit the stock spring seats, and are a good choice at valve lifts of .510" or less. It would be a shame to have such nice springs and a cam profile that doesn't even put them throught their paces. A Comp 262HR-12 or 264HR-12 might be good places to start looking.

Of course, a cam swap on your '92 speed density car will mean you should probably do soem PROM writing for maximum effectiveness, but you should probably already be doing that anyway.

 

Thanks guys.

Ed Maher this is the motor out of the B4C car and I would never spray it. I am going to do a little clean up on the heads, my machineist showed me were to concentrait inside the ports.

Vader do you think that with out working on the chip would the 264HR-12 pass emissions testing, I am burring chips for the Z but I need to get the car inspected as soon as I get finished doing the rebuild.
I have to pass the dyno emissions test here now so it’s got to be clean.

 

Z,

Both those cams have a respectable LSA and not a lot of overlap. Passing emissions shouldn't be a major issue unless you trim the fuel really high to take advantage of the cam. You could always get it running, get the cert, then play with the fuel injector timing, spark curve, enrichments, etc. If anything, the engine might be a little lean with the stock PROM if the cam is timed correctly.

 

Thanks Vader
Thanks Vader
Good thing I got my income tax return check yesterday, think I will go with the 262HR-12.