Difference of 3.5L bottom end and 3.7L bottom end

98intrigue · 10-06-2011, 12:35 PM

Does anyone know if I can buy a 3.5L bottom end and build it? Obviously, they are much more available than the 3.7Ls. I've heard they are the same...but would rather have some experts answer, rather than hearsay.

esfourteen · 10-06-2011, 01:13 PM

Quote:

Originally Posted by 98intrigue

Does anyone know if I can buy a 3.5L bottom end and build it? Obviously, they are much more available than the 3.7Ls. I've heard they are the same...but would rather have some experts answer, rather than hearsay.

15psi was a little too much eh? AM Performance runs the HR head on the VHR block, so it might be possible to run the HR block with a VHR head. Maybe hit them up and see if they have more info.

98intrigue · 10-06-2011, 07:15 PM

Quote:

Originally Posted by esfourteen

15psi was a little too much eh? AM Performance runs the HR head on the VHR block, so it might be possible to run the HR block with a VHR head. Maybe hit them up and see if they have more info.

No, actually the noise I'm hearing started as soon as I did the first run with race gas. I hit 13.1psi, compared to my normal 12.4psi and the car only trapped 120 that run. The car trapped 120 my very first run of the night on 93oct and the car hit 12.1pwi. So I know the HP increase wasn't much at all.

I just got home from seeing a friend at Infiniti. He reset my VVEL and the noise was gone!!! I back out of the bay and there it was again

The noise is definitely coming from the top of the motor, so it's not a rod issue. I'm changing the oil now and I'm going back tomorrow to have the VVEL reset again.

I may be able to get my hands on a bottom end

Build it slowly over time.

SPOHN · 10-06-2011, 07:41 PM

Quote:

Originally Posted by esfourteen

AM Performance runs the HR head on the VHR block, so it might be possible to run the HR block with a VHR head. Maybe hit them up and see if they have more info.

I've actually talked to someone about this before. From my understanding it's not that hard to do. Mostly getting the heads and a new harness to make it work. Maybe not that simple but it sounded that way. If I was going for a good build getting rid of the VVEL would be a plus. Especially for more of a race oriental environment. It was slighty stated that the VVEL holds the car back a little for these conditions. Or until this VVEL can be hacked and worked with.

1slow370 · 10-07-2011, 07:17 AM

the block in mike's car at gtm is a vq35hr block with gtm internals the 370 internals should fit but the stroke is different

HKYStormFront · 10-07-2011, 08:01 AM

the 370 engine block is identical (from what i've heard) to the 07+ 350z/G35 engines, the VQ35HR. it's also the same as the VQ40 in my truck, though i don't have the dual intake. non-VVEL HR heads should work on your motor with no issues, may have to use a different timing chain

1slow370 · 10-09-2011, 11:28 PM

k believe the vq40 had a different deck height and thought there were other changes as well?

HKYStormFront · 10-10-2011, 07:51 AM

from what i've seen (there's only been a few apart that have been posted on the forums) they look identical. i don't know the actual specs from nissan tho

10-06-2011, 12:35 PM	#1 (permalink)
98intrigue A True Z Fanatic Join Date: Jul 2010 Location: Clearwater, FL Age: 38 Posts: 4,855 Drives: 2014 Viper Rep Power: 429	Difference of 3.5L bottom end and 3.7L bottom end Does anyone know if I can buy a 3.5L bottom end and build it? Obviously, they are much more available than the 3.7Ls. I've heard they are the same...but would rather have some experts answer, rather than hearsay. __________________ Ryan - 2014 Stryker Green Viper Gone - a few Vipers and a couple turbo VQs

10-07-2011, 07:17 AM	#5 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7250	the block in mike's car at gtm is a vq35hr block with gtm internals the 370 internals should fit but the stroke is different __________________ ANSWER PRICE LIST Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50

10-07-2011, 08:01 AM	#6 (permalink)
HKYStormFront A True Z Fanatic Join Date: Apr 2009 Location: Greer, SC Posts: 14,954 Drives: 06 Frontier SE 6spd Rep Power: 52	the 370 engine block is identical (from what i've heard) to the 07+ 350z/G35 engines, the VQ35HR. it's also the same as the VQ40 in my truck, though i don't have the dual intake. non-VVEL HR heads should work on your motor with no issues, may have to use a different timing chain __________________ Patrick // 06 Frontier 6spd Nismosis // Mods: Uprev Tuned @ Z1 Motorsports: 257whp & 292 ft lbs 09 Pontiac G8 GXP // M6 // Sunroof // Tint... For now

10-09-2011, 11:28 PM	#7 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7250	k believe the vq40 had a different deck height and thought there were other changes as well? __________________ ANSWER PRICE LIST Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50

10-10-2011, 07:51 AM	#8 (permalink)
HKYStormFront A True Z Fanatic Join Date: Apr 2009 Location: Greer, SC Posts: 14,954 Drives: 06 Frontier SE 6spd Rep Power: 52	from what i've seen (there's only been a few apart that have been posted on the forums) they look identical. i don't know the actual specs from nissan tho __________________ Patrick // 06 Frontier 6spd Nismosis // Mods: Uprev Tuned @ Z1 Motorsports: 257whp & 292 ft lbs 09 Pontiac G8 GXP // M6 // Sunroof // Tint... For now

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