How many guy running 4.1, and how they running?
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sixgun86gn
six offender
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484 production block bored .060 over.
Comp 268 high energy cam (218/218)flat tappet
3200 stall,TE63,extender chip,ZO6 maf and translator +,ported heads and intake,PTE front mount,southside bars.
I think thats about it as far as the important parts.
The block was bored .060 because the pistons I bought were a used set from a stage 2 motor that I picked up for $150 and they were 4.020. Never overheated and ran great.
Comp 268 high energy cam (218/218)flat tappet
3200 stall,TE63,extender chip,ZO6 maf and translator +,ported heads and intake,PTE front mount,southside bars.
I think thats about it as far as the important parts.
The block was bored .060 because the pistons I bought were a used set from a stage 2 motor that I picked up for $150 and they were 4.020. Never overheated and ran great.
boostingbuick
Going to be buried in this.
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4.1 block here. 4.030 bore with stock turbo crank and rods. Girdled. Ran 10.91 on 93 and a 255/50/16 drag radial. No issues other than traction. Spools my 72 q-trim rather fast. I have no plans to ever go back to a 3.8.
boostingbuick
Going to be buried in this.
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And at 128 mph.
yeah, i've always wanted to do a 4.1. I think I might just buy a motor to build, and then throw it in when I break something major on the 109! I'll probably put a built tranny in with it.
tom j, your setup is what I'm probably gonna go with -- e85 and 25 lbs or more of boost. that kind of performance from pump gas is amazing.
tom j, your setup is what I'm probably gonna go with -- e85 and 25 lbs or more of boost. that kind of performance from pump gas is amazing.
Well i got my pistons, and block is being finished. I will need all you guys help when i have dumb ??? Like crank end play,how to set, and how important is it.Fully ported, heads, and intake should do good on the 4.1. I hope Jack Cotton do me right on the turbo!!
sixgun86gn
six offender
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Just an 84-85 4.1 block the last three numbers are 484 on the casting #.
You could find them in a few cadillacs and some larger buicks and olds.
I just hit up Chris McDade on here in houston and buy one from him when I need one,I get them for about half of what a 109 block costs me.
THX
Did you have a girddle, i cany afford one, but thinking of a little hard block.
What is floating rods?
sixgun86gn
six offender
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Neither girdle or caps,just ARP main studs. No need for any more than that down to mid 10's.
sixgun86gn
six offender
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They are bushed on the ends with a spirolock in the piston skirt,you don't have to press them on. Nice,but not really necessary inless you want every last HP you can get. Motor might make another 5 hp maybe.
I just used stock rods and crank and I have also pushed the NA crank to the same power levels with no problems in the past.
sixgun86gn
six offender
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Not off the top of my head,but they are the same ones for the 3.8.
sixgun86gn
six offender
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- Feb 10, 2002
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either will have them
Well i will have to use them to fit my budget, but i didnt know it, but my 109 has them in it, and i have blown the HG at least 6times getting all kinds of knock, and they havent broke yet. This is a cheap build to see if i can do it. All i can say is if they havent broke with me, there some dam good pistons. This last time i blew mt HGs i got 105 in knock, and they are still good.
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