... I couldn't be happier with the boost in performance. Before I had a chance to get to the track, driving it on the street I could immediately feel the better throttle response and how it wound up quicker.
I hit the 1/8 mile track last night and found I had picked up almost 2 tenths in E.T. and 3 MPH! I went from a speed of 81 to 82 mph to 85 plus and my best ET was 8.213. This was with a full tank of gas! With a little more caressing of the tune, I think it will do at least another tenth faster, as it isn't totally dialed in yet!

(Mod's so far)
(383 stroker, w/ .230- .230 -480-480 lsa 108 cam, Hedman long tube headers, stock heads, First Injection TPI system, 32 lb bosch III injectors, beefed 700R-4 with BM shift kit, nitto drag radials.

Like most C-4's my remaining problem is still with the radiator and climbing temperatures. I replaced the radiator with another new stock radiator less than a year ago, and check it frequently for debris.

Living in Florida in the summer brings daily temp's at 90 plus for months at a time. Running w/o the air on I have no problems as it will run at 210 to 215 degrees during the day, and 198 to 205 at night. But, when I turn on the air it slowly goes up to 225 and beyond and the stock compressor really pulls a lot of juice (electric) and horsepower from the motor. (I'm using a stock 195 degree thermostat.) I'm wondering if there is a compressor from another year Vette that might draw less HP and run cooler.

At any rate, I think I will switch to a better radiator soon.

Steve

 

I never have a problem with heat only when stoped does it climb.
With the air on mine runs 202-205 in 95 degree heat,I live in Tampa Fl.
I clean the rad out every few months and I'm running about a 65-70% antifreeze.I use Prestone anycolor,works great for me.
Wiyhout the air and the fan on mine runs about 200(I have a manual switch also),I don't like seeing 227-235 deg.TOO hot in my opinion.

 

Dewitts !

I have a new Dewitts radiator in the box waiting for the 355 install (happening soon). The build quality is superb, its so damn pretty its going to be a shame to bury it in my engine compartment.

Anyway I bought it on the advice of many forum members here,there were all very happy with theirs.

 

Congrats on the swap, glad to hear the 3.75's are a good improvement.

 

stevie1dr,

What shape is your A/C condensor in? I pulled mine 1 1/2 years ago at the same time I pulled the radiator, and all-though it looked clean with a casual inspection, it was all most completely plugged with small items. I held it against the sun, and could not see much light getting through.
I spent several hours of blasting with air,water,simple green, and picking piece's out until it finally cleaned up.

Last summer while cruising, with air turned on, I ran 195f with outside temps 100-110f

your coil might look clean, but a closer inspection may show other wise.

just a thought....

 

Dewits is the way to go. After moving to Hot-lanta, my factory radiator quickly gave up the ghost and I am just running the basic ZZ4. It would continually drive the temp up to 225 - 230 in stop/go traffic and after 2 summers it just died. The Dewits with a low temp thermostat runs at 180. Period. A/C or not. The factory fan kicks on at 186 and it very quickly drops right back to 180.

Not only does it look terrific and work great, it fit correctly out of the box!