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Author Topic:   How do you feel about a 358 roller motor in a Mod?
mdsteacher
Dirt Maniac

Total posts: 145
posted January 16, 2005 01:11 PM  
How do you other racers feel about a 358 roller motor in a dirt mod. 358 with splayed caps.

Xtreme12x
Dirt Forum Champ
Total posts: 874
posted January 16, 2005 03:48 PM  
should run pretty good turn it tight as long as its got the parts to turn a lot... we ran a 358 in a car for most of the year in 03 and it ran really good

racin78p
Dirt Freak

Total posts: 333
posted January 17, 2005 12:17 AM  
A mod buddy of mine has a 355 (358) that he ran for quite a few years. Went through 4 blocks, but the rotating assembly is still there. He went to big motors (420+) simply because he landed a heck of a sponsor. The 355 is still in a crate and takes it as a back up when he travels to different shows. And he ain't lookin' to sell it either! (I tried).

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racin78p
if it ain't fun, then don't run

Raz_900
Dirt Forum Champ
Total posts: 635
posted January 18, 2005 07:27 PM  
Make sure it's a solid roller and not a hydro, good valve springs a must and rev kit even better. Wring it's neck and should work out pretty well. Although, if you're running against 400+CID motors, you're going to need at least 7800-8200 rpm to make up the CID difference.

flying3j
Dirt Roller

Total posts: 23
posted January 18, 2005 08:37 PM  
I run a 358 roller motor, all top of the line parts,on alky and turn it 7800 to 8000
2 nights a weekend and have had excellent luck-I would recommend this combo to anyone.I have 2 of them and both go 570 and 570++ on the dyno,3000 ft. above sea level.I am going to try a short stroke long rod combo just to see if there is an advantage. Anyone got any opions?

dirtbuster
Dirt Forum Champ
Total posts: 2007
posted January 19, 2005 07:06 AM  
Id agree with the others. The roller will help build torque and HP over a solid. I know severl guys that run 358 with solids and do well so a roller would be even better. If you wanted to go a little bigger CID i'd look into a 377 type combo. Then you could still turn the rpms if you wanted.

mdsteacher
Dirt Maniac

Total posts: 145
posted January 20, 2005 08:38 PM  
Well I picked up a complete 358 solid roller engine from a USMTS guy with all good parts plus splayed caps. He ran on alky and turned over 8000 with it but I'll be running on gas and probably won't turn it more than 7500. It was just refreshed 5 races ago but my engine guy is going through it to double-check everything. I hope it works out for me. I considered 400 block engines but am too leery about block cooling on gas (plus 400 stock block longevity is always an issue).
Thanks for the replies.

FASTLAP
Dirt Maniac

Total posts: 171
posted January 23, 2005 05:28 AM  
mdsteacher,
just as reassurance, I ran a 355 full tilt roller this year (610 on dyno) and turned 7700. wasn't hard on the motor and stayed right with the bigger cubes. Very reliable combo.

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