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Author Topic:   360 sprint engine in mod ?
jonniet
Member
posted October 14, 2003 05:02 PM
my uncle ran sprints from the 70s to the mid 80s he has a fresh 360 thats been sitting since 1988 or so ....11x heads carillo rods roller cam, rev kit ,knife edged steel chevy crank ....rods I believe are an odball length ...not sure how long?...anyway he wants 5,000 from injectors to wet sump pan ....I told him I had no use for injectors but he says he wont seperate.....I need a more competative motor than my 6 inch rod 355. ....there are lots of 406 and larger engines around here ,and we run U.M.P rules so the 11X heads should be good ....I need an opinion on running the 360 sprint motor against some of the more common motors in mods today,and does 5,000 sound like a fair price?.....need help with wise desision ,I only have one chance to make it right....poor racer lack of funds


2nd2none
Member
posted October 14, 2003 05:06 PM
if that motor has been sitting 15+ years i'd probably give $1000 for it. I'm sure its rusted up on the inside.

I'd say spend your $5000 on a more recent used motor.

Wauge28
Member
posted October 14, 2003 07:27 PM
JT, for 5K I will sell my 421 CI with ProAction Alum heads, Eagle steel crank, Eagle H-beam rods, and custom J-E pistons. Crower roller cam and stainless steel rockers. The block has $ 2000 in it with 4 bolt splayed billit caps. They were added to a 2 bolt block so they are angled bolts (stronger). 650+ HP and it is being freshened as we speak and should be done in a couple weeks. New pistons, rings and bearing. As you know, I blew my back up last week and am looking to build two "medium" sized motors. This thing is a monster!

mwauge@charter.net

racer17j
Member
posted October 14, 2003 07:53 PM
there is no replacement for displacement get a 406 or stroke your 355


Dustejr73
Member
posted October 14, 2003 08:08 PM
Thanks guys ,thats the info I was looking for ....my little 355 is plenty strong if the track conditions are right ,but I think my new car will be a little more hooked up than the last one .......hey Mark ,the 421 sounds like a good deal ! but honestly overall would a 383 or 406 be the way to go for our local tracks ?.......when I was setting up the 68 pro stock years ago we had a 421 at the start of the season but the throttle regulator (right foot ) was screwed up and we hit 8 grand one to many times....we went to a claimer 406 stock rod hyper pistons and the car worked realy well....seamed like controlable power .....I never drove the car so I dont realy know how it felt but for a cheap engine it sure was strong I think that motor is still alive and well somewhere.....Dave,are you saying that 406 is hard to hook up on dry? and 355,377,383 are more controlable?....thanks for the input,I cant wait to get the new car on the track !


Wauge28
Member
posted October 14, 2003 10:22 PM
The trick is not blowing the tires off coming out of the turn. Typically, more cubes make more torque. Torque is good if its not too much too soon. The secret to a BIG motor is to build it so it is a little "soft" up to about 4500 rpm. Now, when I say soft, I don't mean marshmallow. My 421 can break the tires loose at any point on the track...ANY POINT. The "soft" thing is that it doesn't react so fast that your foot doesn't have time to respond. I had a 370 2 years ago that was so violent, it almost wasn't drivable. The power hit so hard and so fast, tires would never hook up. I ran my 421 at Yreka almost every race this year. You saw how dry it was in the two 50 lappers we had there and it was very easy to drive. The secret is in the cam shaft and compression...thatís all I can say for fear of my motor guy hunting me down.
There are always ways to take away power...Very hard to add HP when you need it.


jonniet
Member
posted October 15, 2003 05:38 PM
If you still have the motor in a couple of months ,you might be getting a phone call....thanks for the input.